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| Main Authors: | , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2403.17412 |
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| _version_ | 1866909152036519936 |
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| author | Maeshima, Nobuya Hino, Ken-ichi |
| author_facet | Maeshima, Nobuya Hino, Ken-ichi |
| contents | We study low-lying spin-singlet excitations of two-leg Hubbard ladders with site-dependent potentials. Using general formulas of the charge disproportionation induced by the site-dependent potentials, we derive the contributions of spin degrees of freedom to the spectral functions such as the dynamical charge structure factor $N(\boldsymbol{k},ω)$ and the optical conductivity $σ_γ(ω)$ along the $γ(=x,y)$-direction of the two-leg ladders. Numerical results obtained by the Lanczos diagonalization method have clarified that the multi-triplon singlet states, including two- and three-triplon excitations, can be detected by observing these quantities. Furthermore, we have found that ladders with random potentials also have non-negligible contributions of these excitations to $σ_x(ω)$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_17412 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Multi-Triplon Excitations of Hubbard Ladders with Site-Dependent Potentials Maeshima, Nobuya Hino, Ken-ichi Strongly Correlated Electrons We study low-lying spin-singlet excitations of two-leg Hubbard ladders with site-dependent potentials. Using general formulas of the charge disproportionation induced by the site-dependent potentials, we derive the contributions of spin degrees of freedom to the spectral functions such as the dynamical charge structure factor $N(\boldsymbol{k},ω)$ and the optical conductivity $σ_γ(ω)$ along the $γ(=x,y)$-direction of the two-leg ladders. Numerical results obtained by the Lanczos diagonalization method have clarified that the multi-triplon singlet states, including two- and three-triplon excitations, can be detected by observing these quantities. Furthermore, we have found that ladders with random potentials also have non-negligible contributions of these excitations to $σ_x(ω)$. |
| title | Multi-Triplon Excitations of Hubbard Ladders with Site-Dependent Potentials |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2403.17412 |